Journal
RSC ADVANCES
Volume 7, Issue 60, Pages 37929-37937Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra07460c
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Funding
- National Natural Science Foundation of China [51273220]
- Fundamental Research Funds for the Central Universities [2017NZYQN17]
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Core@shell structures of Fe3O4@Mn2+-doped NaYF4: Yb/Tm nanoparticles (NPs) with multifunctional properties were prepared using a hydrothermal route with a seed-growth procedure. The effect of Mn2+ ions on the phase, shape, and upconversion luminescence (UCL) of Fe3O4@Mn2+-doped NaYF4: Yb/Tm NPs was explored using X-ray diffraction, transmission electron microscopy, dynamic light scattering, and photoluminescence spectroscopy. Furthermore, hydrophobic to hydrophilic surface modification of the Fe3O4@Mn2+-doped NaYF4: Yb/Tm NPs was achieved by coating the NPs with an amphiphilic polymer (poly(maleic anhydride-alt-1-octadecene) (C18PMH)) modified with amine-functionalized methyl ether poly(ethylene glycol). Then, the NIR-to-NIR UCL ascribed to the Tm(3+)ions, T-1-weighted MRI ascribed to the Mn2+ ions, and T-2-weighted MRI ascribed to the Fe3O4 core of the hydrophilic Fe3O4@Mn2+-doped NaYF4: Yb/Tm NPs were evaluated. The results indicate that Mn2+ doping is an effective method to control the size/shape and improve the UCL intensity of Fe3O4@Mn2+-doped NaYF4: Yb/Tm NPs, which are promising as imaging agents for NIR-to-NIR UCL and T-1/T-2-weighted MRI in biomedical research.
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